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Topic Review (Newest First)

05-03-2011 07:03 AM

Jim Rockford

Just painted a buddies honda prelude last night and got the same results using Nason singlestage. Needless to say I was pissed cause this is a super cheap paintjob for him. Glad to hear the wetsanding helps alot,

03-07-2011 02:46 PM

brimcp99

It turns out it was solvent pop (or atleast something that causes little craters), after sanding with 1200 grit to 2000 then buffing there are still little craters there. I think it may have been the fact it was a very hot day when I was painting.

03-03-2011 10:16 AM

Daz_uk

I've seen something similar with 2K clear when I've used my infra red dryer too soon after spraying.Basically the paint dries to quickly.It always flats out and buffs up

03-03-2011 06:53 AM

302 Z28

A rainy day helps to hold down the dust and trash, perfect dy to paint.

Vince

03-02-2011 05:45 AM

jcclark

Quote:

Originally Posted by brimcp99

Its annoying that I didnít record the temp/humidity from my weather station that day because I still donít know when I should stop painting in certain conditions.

I paint when it's raining and the humidity is 100%,
I prefer to because I get cleaner jobs.
I've never had a problem with humidity, other than having
to wait longer for flash times.

03-02-2011 04:59 AM

Derkyb

Trust me when i tell you its moisture in the lines/air! I wouldnt be so sure if hadnt happened to me last week. It looks like tiny craters but there are some that have nibs and in the light it looks like a mettallc paint job, I bet when you sprayed the first coat of base it looked like i was going to fish eye but then easily covered with the second coat. I sanded and recleared also and it helped but was still there. I was confused too because it didnt always happen with all components being the same. It depends on the weather and how hard you work the compressor. To test it get one of those dessicant filters(not harbor freight they dont let air flow through) with the windows at the gun and watch them go from blue to pink before you finish your second coat

03-02-2011 01:27 AM

brimcp99

Just an update, I did some wet sanding to find out whatís going on, they definitely stick out from the paint surface but then also seem to have a crater in the middle.

So maybe they are a fine solvent pop, the fact I sprayed on a hot humid day may have caused a skin to form to quick.

Its annoying that I didnít record the temp/humidity from my weather station that day because I still donít know when I should stop painting in certain conditions.

03-02-2011 12:02 AM

Lizer

oops I meant Barry, not Bruce. Bruce is the suspension expert I talk to.

03-01-2011 10:44 PM

Lizer

I think it depends on what you mean when you're saying 'more important.'

I wanted to spray my SPI epoxy on a warm (but not hot) humid day. I called Bruce and he said my conditions were perfect because it wouldn't make the solvents flash too fast. So, to an extent, some humidity can be a good thing. According to Bruce.

03-01-2011 09:08 PM

brimcp99

hmmm. Thanks for the replys.

In a way I would be suprised if it was solvent pop because it was a really warm day when I painted and I let it dry for atleaset 30 min between coats.

To be honest my airline filtration system is a bit slack, it only consists of a copper tube spiralled through a tub of water and a water trap. I was wondering about that "iso clumping" issue. Why is this never mentioned in paint defect guides and data sheets?

Do you think its the humidity in the booth or in the airline thats more important?

03-01-2011 08:45 PM

302 Z28

I vote for solvent pop. Sand them out then place the car or part in direct sun for an entire day before re-coating. When re-coating mist on the first coat then extend the flash time for the second and following coats.

Vince

03-01-2011 08:34 PM

Derkyb

nope its moisture in your lines! I just had the exact same problem last week and the only thing that solved it was buying a refrigerated dryer for the compressor from harbor freight for 400. How far away is your compressor from your supply? do you have a see through dessicant filter at the gun? I cant remember where I read the thread from barry but he said that stuff that looks like sand is actually the iso's crystalizing due to the moisture or something like that but the dryer definitely solved it. Oh and It wont matter how many filters and water separators you have it will only slow it down but will still be there, trust me I had three dryer filters and a separator and still got water at the gun.

03-01-2011 08:30 PM

Runnin'OnEmpty

Quote:

Originally Posted by brimcp99

Oh really? When ever ive had it before its been bigger and more of a liitle crater than a nib, thanks.

Well now that you mention it, solvent pop does form craters.
Are you saying these nibs are on the very top surface of the paint?

Maybe try looking at it using a strong shop light and a magnifying
glass...? See if the nibs are actual particles like dust, or bubbles
in the paint film...

03-01-2011 04:57 PM

brimcp99

Oh really? When ever ive had it before its been bigger and more of a liitle crater than a nib, thanks.

03-01-2011 02:36 PM

Runnin'OnEmpty

After seeing the pics, it certainly looks like solvent pop.

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